1985 Trans Am High Idle
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Joined: Jul 2008
Posts: 37
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From: Upstate NY
Car: 1985 Trans Am
Engine: 5.0 TPI
Transmission: Auto
1985 Trans Am High Idle
I have a 1985 Trans Am 305 TPI Auto with a high idle and when i go to put it in gear the tires spin and somtimes with brakes on. Could it be the Thermostat or Idle Air Control Valve? Thanks
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Joined: Aug 1999
Posts: 2,842
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From: Rowlett, TX
Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Re: 1985 Trans Am High Idle
Is your check engine light on? I would first try properly setting the IAC and idle speed. Directions here:
https://www.thirdgen.org/tpimod2
Also, verify that base timing is set correctly with a timing light - if it's too far advanced it could bump up the idle speed.
https://www.thirdgen.org/tpimod2
Also, verify that base timing is set correctly with a timing light - if it's too far advanced it could bump up the idle speed.
Thread Starter
Junior Member
Joined: Jul 2008
Posts: 37
Likes: 0
From: Upstate NY
Car: 1985 Trans Am
Engine: 5.0 TPI
Transmission: Auto
Re: 1985 Trans Am High Idle
After warm up and somtimes a little harder to start it takes more cranks or have to hold the key longer to start but yes does this when warm.
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